Organometallic chemistry in supercritical fluids. The generation and detection of dinitrogen and nonclassical dihydrogen complexes of Group 6, 7, and 8 transition metals at room temperature
The syntheses of two new metallocenic analogues of phenylalanine: D,L-β-cymantrenyl alanine and D,L-β-tricarbonyl(cyclobutadienylalanine)iron are described.
Direct lithiation of (cyclobutadiene)tricarbonyliron and ((trimethylsilyl)cyclobutadiene)tricarbonyliron with sec-butyllithium: selective para metalation
作者:Uwe Bunz
DOI:10.1021/om00033a035
日期:1993.9
(Cyclobutadiene)tricarbonyliron (1a) is metalated on treatment with sec-BuLi in THF, as could be shown by reaction of the product (lithiocyclobutadiene)tricarbonyliron (1b) with a variety of electrophiles (inter alia trimethylchlorosilane, methyl disulfide, methyl iodide, and diiodoethane); the respective adducts were obtained in good yields. Similarly, metalation of ((trimethylsilyl)cyclobutadiene)tricarbonyliron (1c) affords (3-lithio-l-(trimethylsilyl)cyclob-utadiene)tricarbonyliron (3a), which has also been trapped with standard electrophiles. No products of ortho metalation were observed.
Benzoladderene Mechanophores: Synthesis, Polymerization, and Mechanochemical Transformation
作者:Jinghui Yang、Matias Horst、Joseph A. H. Romaniuk、Zexin Jin、Lynette Cegelski、Yan Xia
DOI:10.1021/jacs.9b01736
日期:2019.4.24
yield semiconducting polyacetylene. Herein, we report the scalable synthesis of benzoladderenes as new mechanophore monomers. Ring-opening metathesis polymerization of benzoladderenes yielded homopolymers and block copolymers with controlled molecular weights and low dispersity. The resulting nonconjugated poly(benzoladderene) was mechanochemically transformed into conjugated poly( o-phenylene-hexatrienylene)
Intramolecular London Dispersion Interactions Do Not Cancel in Solution
作者:Jan M. Schümann、J. Philipp Wagner、André K. Eckhardt、Henrik Quanz、Peter R. Schreiner
DOI:10.1021/jacs.0c09597
日期:2021.1.13
determined the relative strengths of these noncovalent intramolecular σ-σ interactions via temperature-dependent nuclear magnetic resonance measurements. The origins of the interactions were elucidated with energy decomposition analysis at the density functional and ab initio levels of theory, pinpointing the predominance of London dispersion interactions enthalpically favoring the folded state in any solvent
Abstract The rotational spectrum of cyclobutadieneirontricarbonyl was measured using a Flygare-Balle-type microwave spectrometer. Twenty a -dipole transitions were measured in the 5–16 GHz range for this prolate symmetric-top molecule. A least-squares fit of the data to a distortable symmetric top Hamiltonian yielded B = 961.9856(8) MHz, D J = 0.184(8) kHz, D JK = 1.20(3) kHz. These results indicate
摘要 使用Flygare-Balle型微波光谱仪测量了环丁二烯三羰基铁的旋转光谱。在 5-16 GHz 范围内测量了这种长对称顶部分子的 20 个偶极跃迁。数据与可变形对称顶部哈密顿量的最小二乘拟合得出 B = 961.9856(8) MHz,DJ = 0.184(8) kHz,D JK = 1.20(3) kHz。这些结果表明环丁二烯环的振动平均结构是方形并垂直于α-分子轴。